The Arceuus spellbook, sometimes referred to as the necromancy spellbook, is a spellbook which makes use of reanimation spells from ensouled heads, which gives Prayer experience and favour with Arceuus.

In order to access the spellbook, players must have gained 60% favour with Arceuus in Great Kourend. Making extensive use of blood, nature and soul runes, the spellbook also has several teleportation spells to the mainland, primarily teleporting the player to locations associated with death, such as graveyards and dungeons with undead.

Because of the low supply of law runes within the kingdom, the study of teleportation magicks has always been very limited throughout Great Kourend's history, with Xeric being the only known user of teleportation spells. However, with a larger wave of visitors from the mainland arriving to Great Kourend, a steady supply of law runes became available, allowing Arceuus to create teleportation spells to the mainland.

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Players may speak with Tyss to switch to the Arceuus spellbook. Tyss can be found near the Dark Altar on the north end of Arceuus. Alternatively, players can switch back to the normal spellbook by visiting Tyss again and choosing the "I would like to stop using your Spellbook now" option, and he will lift dark magicks from your mind. You will notice your spellbook returning to the normal spellbook immediately.

Players can either use the games necklace to teleport to the Wintertodt Camp and run south-west until they exit the snowy area, then east afterwards. Another method to get there is using the fairy ring code CIS. However, it first needs to be unlocked by speaking to the nearby NPC, Trossa, for a one time fee of 80,000.

Reanimation spells will reanimate certain creatures whose heads still contain their souls. Killing reanimated creatures will grant Arceuus favour for each reanimated creature killed based on their toughness, with more favour being awarded if the Client of Kourend quest has been completed. Players are awarded Magic experience for casting the spell, and Prayer experience for killing the reanimated creature. A majority of reanimated creatures will have a maximum of 35 Hitpoints.

If players are on a Slayer assignment for the appropriate reanimated creature (such as a reanimated abyssal), they will also receive 35 Slayer experience for killing the reanimated creatures. Similarly, if reanimating a Slayer creature, players must have the appropriate Slayer level in order to claim the Prayer experience. The following reanimated creatures will not grant Slayer experience, due to the fact that multiple types of task monsters can drop the same head: demons, giants, horrors, and dragons.

These spells can be cast anywhere across Gielinoronly if the ensouled head is obtained as a drop from the respective monster, and using it within a certain time frame in the area. Teleporting removes the ability for the spell to be cast outside the range of the Dark Altar, and attempting to cast the spell afterward will result in the following message: That creature cannot be reanimated so far from where it died, but the power of the crystals by the dark altar will increase the potency of the spell.

Attempting to cast a reanimation spell whilst in combat will yield an error message stating you cannot do so. However, this check only applies to the same game tick that you take damage, and does not actually check to see if the player is in combat. This means with proper timing, you can cast the reanimation spells even under multiple attacks such as with the dagannoth underneath the lighthouse.

If you do one of the following below after obtaining an ensouled head, you must head to the Dark Altar in order to reanimate the ensouled head.